Added readme

README.md

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+# react-native-gifted-charts
+
+The most complete library for Bar, Line, Area and Pie charts in React Native. Allows 2D, 3D, gradient, animations and live data updates.
+
+## Installation
+
+```sh
+npm install react-native-gifted-charts
+```
+
+## Usage
+
+```js
+import GiftedCharts from "react-native-gifted-charts";
+
+// ...
+
+const result = await GiftedCharts.multiply(3, 7);
+```
+
+## Contributing
+
+See the [contributing guide](CONTRIBUTING.md) to learn how to contribute to the repository and the development workflow.
+
+## License
+
+MIT